4 • BX-240
© Box 73 Amateurfunkservice GmbH 2017
display after which the whole assembly,
display and sockets, must be placed onto
the board. The thin ends of the solder tags
are pushed fully into their respective holes
taking care not to press too hard and that
the tags aren't pushed too deep into their
holes. Now all three sockets can be sol-
dered on the underside of the board. The
display is to be carefully removed while
the remaining components are mounted
and is then subsequently re-attached. The
three mounted socket assemblies are
shown in Fig. 4.
After which the three pushbuttons and
both the battery holders should be installed.
All must have the underside of their hous-
ings on the circuit board (Fig. 5). When
soldering, some form of compensating
support must be used as the socket con-
nections are higher.
The battery holders must be connected to
the correct polarity, the spring connection
is the negative pole (Fig. 5). The battery
holder solder tags are made from spring
steel, please use correspondingly robust
sidecutters to shorten them.
To finish, the BNC socket must be sol-
dered to the board, set up and aligned hor-
izontally at right angles to the boards edge.
The two earth pins should be soldered to
the underside of the board using the 100 W
soldering iron. The solder must flow well
in order to avoid cold spots while at the
same time soldering iron usage must be
kept to a minimum in order to avoid dam-
aging the insulation on the interior of the
socket through overheating.
Fig. 5: Mounted pushbuttons and battery holders
